How can you identify an MC 312 tank?

The identification of an MC 312 tank, which is commonly used for transporting liquids categorized as hazardous materials, can be primarily attributed to its structural features. One of the most notable characteristics of an MC 312 tank is the presence of rings or bands around the tank's body. These rings are specifically designed to provide structural reinforcement and prevent deformation under pressure, catering to the tank's function of safely transporting various hazardous liquids.

While other features such as color and design elements exist in the context of tank design, they are not definitive identifiers of an MC 312 tank. For example, the color blue can be associated with various forms of tankers but does not identify an MC 312 specifically. The flat top design is not exclusive to MC 312 tanks as other tank models might share similar design features. Finally, while reinforced corners are an essential safety feature, they are not unique to the MC 312 model and can be present in different types of tanks used for similar purposes. Therefore, the correct answer focuses on the distinctive circular bands that encircle the body of the MC 312 tank, highlighting its unique construction meant for safe transport of hazardous materials.